Apparatus for pumping liquids.



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APPARATUS FOR PUMPING LIQUIDS. APPLICATION FILED rss. 24, 19,12.

1,19737-'5L-3.v PaIenIeIIsepI. 12,1916.

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APPLICATION FILED FEB. 24| 1912.

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G. MLLER.

APPARATUS FOR PUMPING LIQUIDS.

APPLICATION FILED EEB. 24. 1912.

PatelntedSept. 12,1916.

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G. MLLER.

'APPARATUS FOR PUMFING LIQUIDS` APPLICATION FILD FEB. 24| 1912.

1,197,755. y Patentedsept.12,1916.

GUSTAV MLLER, F BERLIN-CLOIITENBURG, GERMANY.

APPARATUS FOR PUMPING LIQUIDS.

To all whom t may concern:

Be it known that' I, GUsTAV MLLER, a subject of the King of Prussia,residing at Berlin-Charlottenburg, in the Kingdom of Prussia and GermanEmpire, have invented new anduseful Improvements in Apparatusfor PumpingLiquids, of which the follow` turbine, or electromotor, the externaldiameter of the pump must `of course be very small. For largerquantities of liquid the `drawback would then arise that the diameter ofthe inlet, or suction, opening would have to be very large, and wouldeventually much exceedthe external diameter, because,

for theoreticalY and practical reasons, the inlet speed cannot muchexceed ten feet perv second, so that a practically useful pump cannot beconstructed. vAttempts have been made to overcome lthis drawback bydividing the pump into several parallel working disks onv one and thesame shaft, but there is also a limit to such a divisin, owing to thegreat complication of the pump casing, and the .the high speed rotatingdriving engine or unfavorable conditions for guldmg water, as well asthe diiculty of properly supporting the long shaft.

My present invention consists, -in coupling motor with a centrifugalpump adapted to force a comparatively `small quantity of liquid to averygreat height, and in conducting the liquid from said pump to a turbinein which thel energy contained therein is utilized to such an extentthat the water issuing from said turbine still has sucient energy torise up to the height to which it has to be forced. Said turbine iscoupled with the mainl centrifugal pump, and is so constructed that itsspeed of rotation conforms with the normal speeds of rotation ofcentrifugal pumps, that is said pump rotates at the speed at which alarge uantity 0f liquid can be forced with good e ciency.

the

Specication of Letters Patent. Patentedsept, 12 lg, Application ledFebruary 24, 1912. Serial No. 679,675.

enlarge the external diameter of the cenby reducing the num.A

In'the accompanying drawing illustrating Ithe invention by Way ofexamplet Figure 1 1s a diagrammatic representation of the manner ofconnecting the various apparatus. Fig. 2 is a section through acentrifugal -pump, in which a one-sided centrifugal pump disk, that listhe socalled low pressure pump, is combined in one casing with theturblne by which it is driven and with the driving or so called highpressure pump, whichsupplies water under pressure to said turbine. Fig.3 is a section on the line A4-B inI Fig. 2, Fig. 4 is a section througha one-sided combined pump, in which a'feed pump coupled directly withthe slowly rotating pump is adapted to deliver the liquid to the highpressure pump with a certain 1n1tial speed. Fig. 5 showsa sectionthrough a double-sided combined pump, in which a feed pump is providedto deliver liquid. toy

both sides of the high pressure pump.

1 is the driving engine (a high speed -steam turbine, gas turbine,electromotor, or the like), to the shaft 2 of which is directly coupledthe high pressurepump 3, which sucks a comparatively small quantity ofliquid out of the pipe 4 through a branch pipe V5, and Vforces the sameat a high pressure through the pipe 6 to the turbine 7 .which is of thereactionary type. After leaving the turbine 7 the water flows throughthe branch pipe Sto the. pressure main 10` and still has sucient energyto attain the same height as the liquid forced by the low pressure pump9. rIhe low pressure pump is coupled with the turbine 7 by which it isdriven. Said low pressure pump sucks the water put of the suction pipe 4and forces it rinto the pressure pipe 10, inv which the liquid from theturbine 7 also flows. The turbine isl coupled with the low pressure pump9 by the shaft l1. i

In the construction shown in Figs. 2 and Y 3 the low pressure pump 9 iscombined with the turbine 7 and arranged in one and the same casing 12.In said casing the high pressure pump 3 is also provided and thearrangement is of such a character thatv the driving shaft 2 vof thehigh pressure pump is in a line -with the shaft 11 of the low pressurepump. The turbine 7 and the low pressure pump 9 are surrounded by thewell known diffuser 13, through which the liquid is forced into thepressure pipe In the construction shown in Fig. 4 the arrangement issuch that a special @feed pump 14 is provided for the high pressure pump3, which feed pump together with the low pressure pump 9 sucks liquidout of the suction pipe 4: and feeds the same to the i high speed highpressure wheel 3.

the liquid is reduced, (b) for the 10W pressure pump: likewise increaseof the external diameter by lesseni-ng the number of revolutions, and,in addition, an improvement of the efficiency, so that for the entirecombination the drawbacks of high speed pumps of this kind areeffectively overcome.

In practice the concentric arrangement of the pumps inside one casing,thus without a high pressure main, will probably be chosen. Theadvantage is that the energy imparted to the liquid in the highvpressure disk is utilized in the turbine wheel without any previoustransformation of velocity into pressure by which considerable losswould be entailed. Moreover, the casing is then quite as simple as inthe ordinary double-V sided centrifugal pumps.

The turbine 7 in the described arrangement is always referred to as areactionary turbine, which means, that the cross-section of the fluidchannels or passages is larger at the inlet of the turbine than at theoutlet, se` that as the pressure of thefluid lduring its passage throughthe turbine is decreased the velocity must increase, In this manner itis positively avoided, that any translation of velocity into pressureshall take place in any part of the turbine, which always reduces theoperating rate as a result of the accompanyin whirling andirregularities in the Huid. T e pressure, which is necessary to meet therequirements at the outlet of the whole apparatus should only begenerated through the centrifugal force in the high speed pump, incontrast to the known so called rotary diifusers in which the oppositetakes place. In this manner it is provided that the turbine 7 produces,as a reactionary turbine, a better loperating rate than thoseapparatuses which are already art as reactionary turbines.

The turbine wheelvmay be provided in well known manner with severalseries of known in tne blades, in order to obtain a higher number' ofrevolutions, andsaid turbine wheel-may be constructed on a'ny desiredsystem. Further, two or more of the apparatus described can be arrangedparallel to each other, or a high pressure pump may be-caused to act onseveral turbine wheels, or several high pressure pumps may be caused toact on a single turbine wheel. The low pressure pump can also be dividedinto a number of parallel working pumps. Further, several entire plantsmay be combined in series in order to high pressure pump element drawing,its

Huid supply from said main fluid body.

2. The described apparatus for pumping liquids, comprising incombination, a casing, a low pressure centrifugal pump element mountedin said casing and adapted to lifta comparatively heavy Huid body, aturbine carried by said low pressure centrifugal pump element andadapted to drive the latter, and a high pressure pump element alsomounted in said casingl and adapted to deliver a comparatively smallquantity of water under sufficient pressure to drive said 3. Thedescribed apparatus for pumping liquids, comprising in combination, acasing, a high pressure pump disk, rotatable in said casing, a turbinewheel surrounding said high pressure rpump disk and adapted to receivefluidV under high pressure from said high pressure pump disk, a-nd asecond pump disk carried. by said turbine wheel and adapted to be drivenby the latter at a speed to deliver a comparatively large quantity of`fluid under a lower pressure.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

` GUSIAV MLLER.

Witnesses:

, HENRY HAsPER, WOLDEMAR HAUPT.

